ADAPTATION FOR TIGHTENING A LEAD-THROUGH MEMBER

Abstract: An arrangement to seal an element (1), moving in respect to an oblong slit, and to reduce friction, in which slit there is as a slealing at least one medium pressurized tubular sealing (4) characterized in that in the element (1), which moves in respect to the slit, there is a part (6) tapering off towards its ends and the side of which is furnished with a hole (7) for feeding pressurized medium, for instance air, to the sliding face between the sealing (4) and the part (6), and that there is on the side of the part, at least at a certain distance of the said sliding face, a groove (8) along which pressurized medium can be fed.

Description: ADAPTATION FOR TIGHTENING A LEAD-THROUGH MEMBER. This invention relates to an arrangement according to patent claim 1, by means of which an element, movable in an oblong slit, is sealed. Previously known as sealings of inaccurate and their form changing slits are rubber tubes shaped into sealings. One or several tubular sealings have been installed in a slit or arranged in pairs on both sides of the slit. When tubular sealings are made airtight and furnished with the possibility to lead pressure air or retain pressure in the tube, a sealing is produced that yields and allows much play between the parts that have to be sealed. At a proper moment, pressure air is fed to the sealing, for instance when a door, which must be shut, has been closed, whereat the pressure in the tubular sealing does not hinder the closing of the door. In the solution as per this invention tubular sealings are, in a new way, adapted to the sealing function of the element that is moved in or moves in respect to the slit as well as to the sealing function of the slit, whereby the special requirements of the moving element have been taken into account, in order to maintain tightness and reduce friction and wear. The invention is characterized in what is represented in the introduction section of the patent claims. The most important advantages of the invention can be consider¬ ed that the movable element in the slit, can be made reliably sealed, partly due to reduced friction, whereat the tubular sealings do not wrinkle by the slide between themselves and the moving element, and that the reliability is further increased by the notable decrease of wear of the sealing tubes thanks to lubrication by pressure air. Pressure air or other flow to the sealing face also keeps the sealing face free from durt. Pres¬ sure fed to the sealing face with possible lubrication medium contained in it, secures the start of the element without dam- aging the sealing even case of quite a long break of operation in between. The pressure is then allowed to affect the sealing face before the element is set into motion. In the following the invention is presented in detail with re¬ ference to the enclosed drawing, where Fig. 1 is an element in a slit that has to be sealed, viewed from the end. Fig. 2 is a diagonal view of an element moving in a slit. Figure 1 shows the end view of a slit that must be sealed and is formed in a tubular profile beam 3. In the beam a mechanism, only a part of which is shown in the figure, is arranged to move element 1 in the tubular beam direction. In both edges of the slit tubular rubber sealings 4 are glued, the profile of which comprises a planelike section for gumming and the actual tubular part. The slit is sealed by tubular rubber sealings when pressure air is fed into tubes 4. The tube sides touch each other and close the slit. The sectional view in figure 1 shows the location of element 1. The element 1 is supported on the beam edges by rollers 2 tra¬ velling along the edges. At the sealing tubes 4 the element has a portion 6 tapering off towards its ends and a measuring sen¬ sor 5. Thus the measuring sensor 5 can, as a movable part, be taken to a space of different climate by means of the said slit sealing. Measuring device 5 or any other instrument is placed in hard and difficult conditions, for instance for crosswise measuring of web in a paper machine. By means of slight over¬ pressure, normal climate can be produced inside the profile beam thanks to the sealing function. Figure 2 shows a diagonal view of element 1. Part 6, which tapers off towards its ends, is in slide contact with sealing tubes 4. Thanks to tapering, the sealing tubes adjust well to the surface of part 6 and neither does the part strive to damage the tubes. On the sliding surface of part 6 there is a groove 8 into which pressure air is fed through a hole 7 along canalization 9. A slight air leak from groove 8 and the press¬ ure impact on the side of tube 4 reduce friction, substantial¬ ly, in the sliding surface and, accordingly, also wear of tube 4. The pressure air can contain lubrication oil or other med¬ ium. In addition to pressure air, pressurized gases or liquids can also be fed to groove 8, upon need. The flow of these med¬ iums on the sealing surface keeps also the surface clean. The pressurized gas fed to the groove can be same gas, by means of which overpressure is maintained on either side of the sealing face. By means of the solution measuring devices or similar sensing devices, sampling collectors, feed nozzles or tools can be taken through the sealing face into any other condition, where the climate can be, for instance, durty, corrosive or toxic. Anyhow, the conveying devices of the elemnt are in a clean climate, for instance inside the profile beam, securing the the travel function. The invention is not restricted to the enclosed embodiment but modifications are possible within the inventional concept de¬ termined by the enclosed patent claims. The solution according to the invention can be adapted utilizing one tubular sealing 4, whereby one side of part 6 is curved, as per figure 2, and the other side is straight. The cruved side is against the tub¬ ular sealing 4 and the straight side is against the sliding face formed in the other edge of the slit. The straight side can also be furnished with a hole 7 and a groove 8. In an embodiment a tube beam 3 is used as the movable part while the element is kept immobile.

Claims: PATENT CLAIMS An arragement to seal an element (1), moving in respect to an oblong slit, and to reduce friction, in which slit there is as a sealing at least one medium pressurized tubular sealing (4) characterized in that in the element (1), which moves in re¬ spect to the slit, there is a part (6) tapering off towards its ends and the side of which is furnished with a hole (7) for feeding pressurized medium, for instance air, to the sliding face between the sealing (4) and the part 6, and that there is, at least on a part of the said sliding face, a groove (8) along which said pressurized medium can be fed. 2. A method according to patent claim 1 characterized in that the slit, which must be sealed, is formed in a negatively or positively pressurized beam (3 parallel to the slit. 3. A method according to patent claims 1 and 2 characterized in that in the beam (3) or a similar housing there is a positively pressurized clean space with and that an instrument or a mea¬ suring device (5) on the outer side of beam (3) can be moved by means of element (1) that runs through the sealed slit. 4. A method according to any of the patent claims 1 - 3 cha¬ racterized in that one side of tapering part (6) is straight. 5. A method according to any of the patent claims 1 - 4 cha¬ racterized in that to the groove (8) medium, e.g. water, oil and so on, is fed to lubricate the sliding face. 6. A method according to any of the patent claims 1 - 5 cha¬ racterized in that the slit, which must be sealed, is movable while the element is immobile.

Inventors: KOSKINEN PERTTI, KOSKINEN, PERTTI
Applicants: ENFOPLAN OY, KOSKINEN PERTTI, KOSKINEN, PERTTI
Application year: 1994
Main classification: F16J15
IPC codes: F16J15, G01B3, G01D5